Number of subjects according to their specification of LBP within the preceding 12 months at baseline and follow up in 1992 (n=627)
| 1991 | |||||
|---|---|---|---|---|---|
| 1992 | 0 days | 1–7 days | 8–30 days | 30–90 days | >90 days |
| 0 days | 134 | 35 | 10 | 0 | 1 |
| 1–7 days | 42 | 106 | 52 | 22 | 1 |
| 8–30 days | 14 | 55 | 76 | 19 | 1 |
| 30–90 days | 2 | 5 | 20 | 19 | 4 |
| >90 days | 1 | 1 | 0 | 3 | 4 |